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<title>libfluidsynth: Sending MIDI events</title>
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<div id="projectname">libfluidsynth
 <span id="projectnumber">2.5.4</span>
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<div class="title">Sending MIDI events </div> </div>
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<div class="textblock"><p>Once the synthesizer is up and running and a SoundFont is loaded, most people will want to do something useful with it. Make noise, for example. MIDI messages can be sent using the <a class="el" href="group__midi__messages.html#ga038a0f309e8004f39cb5491514bfac54" title="Send a note-on event to a FluidSynth object.">fluid_synth_noteon()</a>, <a class="el" href="group__midi__messages.html#gae68ad5cca7a2c47be2f4b1c703ea9d46" title="Sends a note-off event to a FluidSynth object.">fluid_synth_noteoff()</a>, <a class="el" href="group__midi__messages.html#ga070f05518dd8157bfd4361c9b0795659" title="Send a MIDI controller event on a MIDI channel.">fluid_synth_cc()</a>, <a class="el" href="group__midi__messages.html#ga5e515bb98e8d68ffa4fe86a08eff3826" title="Set the MIDI pitch bend controller value on a MIDI channel.">fluid_synth_pitch_bend()</a>, <a class="el" href="group__midi__messages.html#gab4a849f9daa42ddd6919771524542182" title="Set MIDI pitch wheel sensitivity on a MIDI channel.">fluid_synth_pitch_wheel_sens()</a>, and <a class="el" href="group__midi__messages.html#gafd3174fbb81a818afc715dbd5c26f903" title="Send a program change event on a MIDI channel.">fluid_synth_program_change()</a> functions. For convenience, there's also a <a class="el" href="group__midi__messages.html#ga7707713c120a938d399b37c00855e2fa" title="Set instrument bank number on a MIDI channel.">fluid_synth_bank_select()</a> function (the bank select message is normally sent using a control change message).</p>
<p>The following example show a generic graphical button that plays a note when clicked:</p>
<div class="fragment"><div class="line"><span class="keyword">class </span>SoundButton : <span class="keyword">public</span> SomeButton</div>
<div class="line">{</div>
<div class="line"><span class="keyword">public</span>: </div>
<div class="line"> </div>
<div class="line"> SoundButton() : SomeButton() {</div>
<div class="line"> <span class="keywordflow">if</span> (!_synth) {</div>
<div class="line"> initSynth();</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keyword">static</span> <span class="keywordtype">void</span> initSynth() {</div>
<div class="line"> _settings = <a class="code" href="group__settings.html#ga7623af35fb3d1abace21ef7d5b4f4781">new_fluid_settings</a>();</div>
<div class="line"> _synth = <a class="code" href="group__synth.html#ga2aab8e0b82dc9fd086849efacb3c1b1b">new_fluid_synth</a>(_settings);</div>
<div class="line"> _adriver = <a class="code" href="group__audio__driver.html#ga7c66ef86f0008807bdd955770fca6925">new_fluid_audio_driver</a>(_settings, _synth);</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* ... */</span></div>
<div class="line"> </div>
<div class="line"> <span class="keyword">virtual</span> <span class="keywordtype">int</span> handleMouseDown(<span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y) {</div>
<div class="line"> <span class="comment">/* Play a note on key 60 with velocity 100 on MIDI channel 0 */</span></div>
<div class="line"> <a class="code" href="group__midi__messages.html#ga038a0f309e8004f39cb5491514bfac54">fluid_synth_noteon</a>(_synth, 0, 60, 100);</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keyword">virtual</span> <span class="keywordtype">int</span> handleMouseUp(<span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y) {</div>
<div class="line"> <span class="comment">/* Release the note on key 60 */</span></div>
<div class="line"> <a class="code" href="group__midi__messages.html#gae68ad5cca7a2c47be2f4b1c703ea9d46">fluid_synth_noteoff</a>(_synth, 0, 60);</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"><span class="keyword">protected</span>:</div>
<div class="line"> </div>
<div class="line"> <span class="keyword">static</span> <a class="code" href="group__Types.html#gaa363402d3c77333b0f070ba531d034ba">fluid_settings_t</a>* _settings;</div>
<div class="line"> <span class="keyword">static</span> <a class="code" href="group__Types.html#gae265f10ae174a13afe010de50d87e1a4">fluid_synth_t</a>* _synth;</div>
<div class="line"> <span class="keyword">static</span> <a class="code" href="group__Types.html#gac3706330ce49cac5b7dd079e90d376d8">fluid_audio_driver_t</a>* _adriver;</div>
<div class="line">};</div>
<div class="ttc" id="agroup__Types_html_gaa363402d3c77333b0f070ba531d034ba"><div class="ttname"><a href="group__Types.html#gaa363402d3c77333b0f070ba531d034ba">fluid_settings_t</a></div><div class="ttdeci">struct _fluid_hashtable_t fluid_settings_t</div><div class="ttdoc">Configuration settings instance.</div><div class="ttdef"><b>Definition:</b> types.h:37</div></div>
<div class="ttc" id="agroup__Types_html_gac3706330ce49cac5b7dd079e90d376d8"><div class="ttname"><a href="group__Types.html#gac3706330ce49cac5b7dd079e90d376d8">fluid_audio_driver_t</a></div><div class="ttdeci">struct _fluid_audio_driver_t fluid_audio_driver_t</div><div class="ttdoc">Audio driver instance.</div><div class="ttdef"><b>Definition:</b> types.h:45</div></div>
<div class="ttc" id="agroup__Types_html_gae265f10ae174a13afe010de50d87e1a4"><div class="ttname"><a href="group__Types.html#gae265f10ae174a13afe010de50d87e1a4">fluid_synth_t</a></div><div class="ttdeci">struct _fluid_synth_t fluid_synth_t</div><div class="ttdoc">Synthesizer instance.</div><div class="ttdef"><b>Definition:</b> types.h:38</div></div>
<div class="ttc" id="agroup__audio__driver_html_ga7c66ef86f0008807bdd955770fca6925"><div class="ttname"><a href="group__audio__driver.html#ga7c66ef86f0008807bdd955770fca6925">new_fluid_audio_driver</a></div><div class="ttdeci">fluid_audio_driver_t * new_fluid_audio_driver(fluid_settings_t *settings, fluid_synth_t *synth)</div><div class="ttdoc">Create a new audio driver.</div><div class="ttdef"><b>Definition:</b> fluid_adriver.c:343</div></div>
<div class="ttc" id="agroup__midi__messages_html_ga038a0f309e8004f39cb5491514bfac54"><div class="ttname"><a href="group__midi__messages.html#ga038a0f309e8004f39cb5491514bfac54">fluid_synth_noteon</a></div><div class="ttdeci">int fluid_synth_noteon(fluid_synth_t *synth, int chan, int key, int vel)</div><div class="ttdoc">Send a note-on event to a FluidSynth object.</div><div class="ttdef"><b>Definition:</b> fluid_synth.c:1421</div></div>
<div class="ttc" id="agroup__midi__messages_html_gae68ad5cca7a2c47be2f4b1c703ea9d46"><div class="ttname"><a href="group__midi__messages.html#gae68ad5cca7a2c47be2f4b1c703ea9d46">fluid_synth_noteoff</a></div><div class="ttdeci">int fluid_synth_noteoff(fluid_synth_t *synth, int chan, int key)</div><div class="ttdoc">Sends a note-off event to a FluidSynth object.</div><div class="ttdef"><b>Definition:</b> fluid_synth.c:1505</div></div>
<div class="ttc" id="agroup__settings_html_ga7623af35fb3d1abace21ef7d5b4f4781"><div class="ttname"><a href="group__settings.html#ga7623af35fb3d1abace21ef7d5b4f4781">new_fluid_settings</a></div><div class="ttdeci">fluid_settings_t * new_fluid_settings(void)</div><div class="ttdoc">Create a new settings object.</div><div class="ttdef"><b>Definition:</b> fluid_settings.c:261</div></div>
<div class="ttc" id="agroup__synth_html_ga2aab8e0b82dc9fd086849efacb3c1b1b"><div class="ttname"><a href="group__synth.html#ga2aab8e0b82dc9fd086849efacb3c1b1b">new_fluid_synth</a></div><div class="ttdeci">fluid_synth_t * new_fluid_synth(fluid_settings_t *settings)</div><div class="ttdoc">Create new FluidSynth instance.</div><div class="ttdef"><b>Definition:</b> fluid_synth.c:711</div></div>
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